A good friend owns a Powder Coating business,
PowderTech Plus Inc.
They started it when (at least locally) the only people doing powder coating were doing small commercial products, no car parts, no bikes, ect. You could send a note to Richard with any questions, it may take him a few days (yes, they are that busy)but he can give you some good advise. You might check out their FaceBook page too.
https://www.facebook.com/pages/PowderTech-Plus-Inc/307225113250?ref=br_tf
Good Luck..